Polish translation

Signed-off-by: Kwpolska <kwpolska@gmail.com>
Humanization of German

Signed-off-by: Kwpolska <kwpolska@gmail.com>
case fix

Signed-off-by: Kwpolska <kwpolska@gmail.com>
Merge pull request #254 from Kwpolska/master

Polish translation + “humanization” of German strings